ML20206T385

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Recalculation of Temp Rise in Recirculation Pump Room Due to Oil Fire
ML20206T385
Person / Time
Site: Big Rock Point File:Consumers Energy icon.png
Issue date: 07/01/1986
From:
CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:
Shared Package
ML20206T383 List:
References
NUDOCS 8607080104
Download: ML20206T385 (13)
v • d • e


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ATTACHMENT I Consumers Power Company Big Rock Point Plant Docket 50-155 i

1 RECALCULATION OF THE TEMPER /.TURE RISE IN THE RECIRCULATION PUMP POOM DUE TO AN OIL FIRE July 1, 1986 i

i 8607080104 860701 4

PDR ADOCK 05000155-d F PDR a ,

10 Pages OC0686-0103-NLO2

. e CALCULATIONS TO FIND TEMPERATURE RISE IN RECIRCULATION PUMP ROOM Find Pounds of Oil 8.33 lb/ gal water x .89 specific gravity oil 7.41 lb/ gal oil 7.41 lb/ gal oil x 31.75 aal oil 235.27 lb oil Find BTU Content 235.27 lb oil x 20400 BTU /lb 4,799,508 BTU available in oil 2

Find Burn Time for 50 ft Fire 31.75 gal oils

+ 7.48 gal /ft 3

4.24 ft of oil 3

4.24 ft2 of oil

+ 50 ft area

.0848 ft deep

.0848 ft deep x 12 in/ft 1.0176 inch deep 1.0176 inch deep

+ .09375 in/ min 3/32 = .09375 10.85 minute burn time MIO586-1037A-BP01

)

2 Find Heat Absorption Capability of Air 3

30,000 ft / min ventilation x 10.85 min 3

325,500 ft3 air to be heated caused by ventilation

+ 100,000 fts room volume 425,500 ft air to be heated 3

425,500 ft 3 x .065 lb/ft 27,657.5 lb air to be heated 27,657.5 lb x .24 BTU /lb*F 6,637.8 BTU /*F of air (fans on) 3 100,000 ft 3 room volume x .065 lb/ft 6,500 lb air 6,500 lb air x .24 BTU /lb'F 1,560 BTU /*F (fans off) i 1

MIO586-1037A-BP01 1

3 Find Heat Absorption Capability of Concrete 3

100,000 ft room volume Approximate Surface Area of Concrete 3[ 3 4 100,000 ft = 46.4 ft cube can contain volume 46.4 ft x 46.4 ft 2 2,152.96 ft area of one side of cube 2

2,152.96 ft x 6 sides of cube 2

12,917.76 ft total area enclosing volume

- l 2

12,917.76 ft 2 2 x 144 in /ft 2

1,850,157.4 in x 1 inch deep 3

1,860,157.4 in 3 3

+ 1728 in /ft 3

1076 ft concrete 3

x 144 lb ft 154,944 lb concrete -

x .2 BTU /lb*F 30,989 BTU /*F x .6 efficiency 18,593.4 BTU /*F heat absorption capability of concrete MIO586-1037A-BP01

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Find Temperature Rise in 10.85 Minutes Fans on plus concrete absorption 4,799,508 BTU released l

18,593.4 BTU /*F cencrete

+ 6,637.8 BTU /*F air 25,231.2 BTU /*F absoqption 4,799,508 BTU

+ 25,231.2 BTU /*F 190.2*F Rise Fans off Plus Concrete Absorption 18,593.4 BTU /*F concrete

+ 1,560 BTU /*F air 20,153.4 BTU /*F 4,799,508 BTU

+ 20,153.4 BTU /*F 238*F Rise 4

MIO586-1037A-BP01

.6 5

Find Heat Absorption Capability of Water K = 5.4 P = 50 psig Q=K P Q = 38.18 gpa for one head 1 BTU /lb*F specific heat water 60*F water 970 BTU /lb heat of vaporization Flashes only to steam at 212'F

.79 efficiency 60 gpa for two heads One Sprinkler Operating Two Sprinklers Operating Find Pounds of Water Find Pounds of Water 38.18 gal / min 60 gal / min x 8.33 lb/ gal x 8.33 lb/ gal 318 lb/ min 499.8 lb/ min Temperature Rise of Water Temperature Rise of Water 212*F 499.8 lb/ min 60*F '

x 152 BTU /lb 75,969.6 BTU / min 152*F x 1 BTU /lb*F 499.8 lb/ min 152' BTU /lb x 970 BTU /lb 484,806 BTU / min 318 lb/ min x 152 BTU /lb Total Heat Absorbed by Water 48,336. BTU / min Per Minute 318 lb/ min 484,806 BTU / min x 970 BTU /lb + 75,969.6 BTU / min 308,460 BTU / min 560,775.6 Total He_c Absorbed by Water x .79 Per Minute 443,012.72 BTU / min 308,460 BTU / min

+ 48,336 BTU / min 356,796 BTU / min x .79 eff 281,868.84 BTU / min MIO586-1037A-BP01

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Find Time to Sprinkler Operation Fans Off ,No, Concrete Absorption Sprinklers operate at .250*F Ambient - 153*F 97'F rise 4,799,508 BTU 10.85 min 442,350.96 BTU / min 442,350.96 BTU / min

+ 1560 BTU /*F I 283.5*F rise in one minute before sprinklers operate 1,560 BTU /*F x 97'F 151,320 BTU 151,320 BTU

+ 442,350.96 BTU / min

.34 minute to reach 250*F and sprinkler operation; use one minute for water to flow I

MIO586-1037A-BP01  ;

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7 Find Temperature Rise Two Sprinklers Operate Af ter One Minute 60 gpm; Fans Off No Concrete Absorption 442,350.96 BTU / min released

- 443,012.72 BTU / min absorbed 661.76 BTU / min - fire goes out Temperature rise then occurs in first minute only 283.5'F Find Temperature Rise One Sprinkler Operates After One Minute 38.18 gps; Fans Off Concrete Absorption 442,350.96 BTU / min x 1 min 442,350.96 BTU released

+ 20,153.4 BTU /*F 21.95*F rise in first minute; sprinkler does not operate - must rise 97'F 20,153.4 BTU /*F x 97*F 1,954,879.8 BTU needed to rise 97*F

+ 442,350.96 BTU / min 4.4 min to sprinkler operation 10.85 min

- 4.4 min 6.45 min of spr.'nkler operation 442,350.96 BTU / min released

- 281,868.84 BTU / min absorbed 160,482.12 BTU / min remains x 6.45 min 1,035,109.6 BTU released af ter sprinkler operation 1,035,109.6 BTU

+ 20,153.4 BTU /*F 51.36*F rise in 6.45 minutes after sprinkler operation MIO586-1037A-BP01

8 97'F rise in 4.4 minutes to sprinkler operation i

+ 51.36*F rise in 6.45 minutes after sprinkle operation 148.36*F rise l n S~-/- ff"

' Eric A Dorbeck Date ,

4 9

1 I

MIO586-1037A-BP01

Knowns 31.75 gallons of oil - Total gallons in upper and lower reservoir; 30 gallons upper, 1.75 gallons lower 3

100,000 ft volume of room - P& ids M-100, M-102, M-104 30,000 cfm ventilation - P&ID M-125

.24 BTU /lb'F specific heat of air - ASHRE Handbook, Principles of Heat Transfer, by Frank Kreith, Third Edition 3

.065 lb/ft air density at 153'F - Psychrometric Chart-Cargocaire Engineering Corporation, Principles of Heat Transfer, by Frank Kreith, Third Edition 153*F ambient - average pipeway temperature at el 595 and 656, July, 1977, December, 1977 and January, 1978

.20 BTU /lb'F specific heat of concrete - Principles of Heat Transfer, by Frank Kreith, Third Edition 3

144 lb/ft density of concrete - Principles of Heat Transfer, by Frank Kreith, Third Edition K = 5.4 sprinkler - 1/2" orifice of Grinnell EA-1 Assumptions 100% combustion (ie, all energy in fuel converted to heat) 20,400 BTU /lb heat content of oil - NFPA Handbook,15th Edition, Value for SAE 40 Oil p

.89 specific gravity of oil - The Penetone Handbook by Amerace-Esna Corporation l V(41N SAE 30 Oil #W 3/32 in/ min burning rate - NFPA Handbook, 15th Edition, Mid-range for Kerosene 60'F water temperature - estimated lake water temperature 2

50 ft fire - approximate area of sumps one-inch concrete absorbs heat 60% efficiency - considered conservative; no heat absorption by anything else in room (ie, grating, beams, stairs, conduit, etc)

MIO586-1036A-BP01

2 one minute to sprinkler operation from fire start - calculations show temperature l rise to detector operation and sprinkler operation to be around 15-20 seconds; assumes operator delay to push button and open valve. Considered conservative, i

50 psig water pressure one sprinkler operating - static water pressure 110 psig; 38.18 gpa crestes neglegible friction loss; pumps rated at 1000 ppa at 110 psig.

4 Considered conservative.

60 gpa flowing for two sprinklers - based on design calculations and above assumption. Less than double the above assumption. Sixty gpa creates minor friction loss; pumps rated at 1000 gpm at 110 psig.

79% efficiency heat absorption of water - assumes fire spray from nozzle; some large drops; 95% of fires controlled by one sprinkler; 99% by two heads (NFPA) when combined with the assumptions above. Considered conservative.

$ T- 8-/d Eric A Dorbeck Date 1

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4 ATTACHMENT 2 i

Consumers Power Company Big Rock Point Plant ,

Docket 50-155 1

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DRAWING OF A REACTOR RECIRCULATION PUMP July 1, 1986 i

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